
*{
    margin: 0;
    padding: 0;
}
html{
    font-size: 18px;
}
.middle{
    width: 100vw;
    height: 100vh;
    background-color:#F7F9FE;
    display: flex;
    justify-content: center;
    align-items: center;
}
.middle_login{
    width: 20rem;
    min-height: 15rem;
    background-color: white;
    border-radius: 5px;
    box-shadow: 3px 3px 10px gainsboro;
}
.middle_login_span{
    display: block;
    width: 100%;
    height: 2rem;
    font-weight: bold;
    text-align: center;
    line-height: 2rem;
    margin-top: 50px;
}
.userId,.password{
    display: block;
    width: 90%;
    height: 2rem;
    line-height: 2rem;
    outline: none;
    border: 1px solid #DDDDDD;
    margin: 15px auto;
    border-radius: 5px;
}
.submit{
    display: block;
    width: 90%;
    height: 2rem;
    line-height: 2rem;
    outline: none;
    border: 1px solid #DDDDDD;
    margin: 15px auto;
    border-radius: 5px;  
    transition: all 0.5s;     
}
.submit:hover{
    cursor: pointer;
    background-color: #425AEF;
    color: white;
    transition: all 0.5s;
}
.backData{
    display: block;
    width: 90%;
    height: 2rem;
    line-height: 2rem;
    outline: none;
    margin: 15px auto;
    border-radius: 5px; 
    text-align: center;
    color: tomato;
    font-size: 14px;
}
